关键词: 甘蓝型油菜, 细胞质雄性不育(cms), 雌蕊, 雄蕊, 花药, 发育动态

Abstract: In the present study the developmental dynamics of the pistils, stamens and anthers of four cytoplasmic male sterile(CMS) lines and their corresponding maintainer lines of rape(Brassica napus L.) were investigated. The results show that the differences in dynamics of pistil development are relatively small between the male sterile lines and the maintainer lines, and occurr later in the process of the bud development. The differences in developmental dynamics of anthers and stamens are large and occurr early. The anthers differ when the buds are about l mm long; and the stamens differ, evidently, when buds are 3~4mm long. Prior to flowering, the lengths of pistils in the male sterile lines are slightly longer than those in the maintainer lines, while the lengths of stamens and anthers are much shorter than those in the maintainer lines, being just about 1/2 of the lengths in the maintainer lines. In the buds of the male sterile lines, differences in pistil and stamen lengths become evident at 3~4mm bud length stage. The results suggest that in the morphological development of the floral bud in the male sterile lines, the earliest male organ degeneration occurr at the stage of about 1mm bud length. When the bud lengths are 3~4mm long, the male sterile lines can be directly distinguished from their maintainer lines by observations of the differences in stamen and pistil lengths in the floral buds of the male sterile lines.

Key words: BRASSICA NAQUS L., CYTOPLASMIC MALE STERILITY(CMS), PISTIL, STAMEN, ANTHER, DEVELOPMENTAL DYNAMICS